a) Same as Fig. 1b (black circles), but also containing the clusters from Kirk et al. (red squares) and the OB associations (or extended clusters) from Pfalzner & Kaczmarek (2013; blue triangles). b) Average stellar mass as a function of number of detected stars for the data from Kirk et al. The full line indicates the tyical value of themean cluster mass , the dashed lines deviations of ±0.1 from this value. The open symbols indicate clusters for which 0.5 0.7 is not fulfilled.
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